Honeywell RTH6400 - Auto Changeover Details; Low Heat Setting Indicator; Auto Changeover Low Temperature Caution

RTH6400 Programmable Thermostat
15 69-2211EF—05
If the cool temperature is lowered to where it gets close to the heat setting, an arrow next
to heat will show the thermostat is lowering the heat setting down to maintain a 3-degree
separation.
Auto Changeover
CAUTION: To avoid possible compressor damage, do not use Auto Changeover if
the outside temperature drops below 50ºF (10ºC).
Run Schedule
Auto
Cool
Fan
Select
Heat/Cool
Heat
Setting
Inside
PM
73
73
1
:
05
Temporary
M27477
Press Select Heat/Cool to set the heat or cool tem-
perature.
The triangle indicates the cool temperature is
increasing to maintain 3 degrees between heat and
cool settings.